(19)

(11)

EP 0 713 489 A1

(12)

(43) Date of publication: 29.05.1996 Bulletin 1996/22 (21) Application number: 94922335.0 (22) Date of filing: 11.08.1994

(51) International Patent Classification (IPC):  C07D 491/ 04( . ) C07D 493/ 04( . ) C07D 495/ 04( . ) G03C 1/ 72( . ) C07D 491/ 052( . ) C07D 493/ 10( . ) C09K 9/ 02( . ) G03C 1/ 73( . ) (86) International application number: PCT/GB1994/001758 (87) International publication number: WO 1995/005382 (23.02.1995 Gazette 1995/09)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 13.08.1993 GB 19930016857 (71) Applicant: PILKINGTON PLC St. Helens, Merseyside WA10 3TT (GB)	(72) Inventors: RICKWOOD, Martin Southport Merseyside PR8 6AJ (GB) HEPWORTH, John, David Preston Lancashire PR2 7ER (GB) GABBUTT, Christopher, David Blackburn Lancashire BB2 7NY (GB) (74) Representative: Pendlebury, Anthony, et al  PAGE, WHITE & FARRER 54 Doughty Street London WC1N 2LS London WC1N 2LS (GB)